Improved pitman-joint for harvesters



UNITED STATES PATENT QEFICE..

.SALEM T. LAMB, or NEW ALBANY, INDIANA.

IMPROVEDIy Pl'TMAN-JOINT FOR HARVESTERS.

'Specification forming part of Letters Patent No. 100,159, datedFebruary 22, 1870.

To all whom it may concern:

Be it known that I, SALEM T. LAMB, of New Albany, in the county of Floydand State of Indiana, have invented a nevi/and useful Improvement inPitman-Joints for Harvesters; and I do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, in which- Figure l is a perspective viewof my invention. Fig. 2 is a plan of the same. Fig. 3 is a sideelevation. Fig. 4 is a vertical longitudinal section of the same 5 Fig.5, side view of pitman-hook; Fig. 6, edge view of cutterbar hook; Fig.7, back view of pitman-hook; Fig. 8, end view of cutter-bar hook, Fig.9, side view of same; Fig. 10, end view of heel of cutter-bar, Figs. 1land'l2, plan and elevation of tightening-nut.

This invention relates to that class of pitman-joints which areconstructed to yield in lateral directions; and it consists in theconstruction of a joint by means of a hook and eye, constructed topermit an adjustment to compensate for wear, and to take up lostInotion, so that, without varying said adjustment, the pitman may bedetached om the cutterbar.

That others may understand .the construction and operation of myinvention, I will particularly describe it.

A is the cutter-bar, having the ordinary cutter-sections B B secured toit in the usual manner.

The heel C is forged on the cutter-bar, and projects upward a distancesufficient to meet the under side of the usual guide-plate, which issecured'to the inner shoe, to prevent the heel of the cutter-bar frombeing lifted from its seat during its reciprocations.

In the outer end face of the heel C a concave recess, D, is formed, (seeFigs. 4 and 10,) and immediately above this recess a hole, E, is boredentirely throughv the heel, in the direction of the cutter-bar, andimmediately below said recess another recess or notch, F, is formed,extending along the under side of the cutter-bar a short distance.

The artist has represented the parts as upside down in Figs. 3, 8, 9,and 10.

The hook G is formed from a cylindrical rod, bent upon itself, as shownin Fig. 9, and a portion of ,the shank H is turned to a smallercylinder, and has a screw-thread cnt upon its i outer surface.

The hole E is in diameter exactly equal to the diameter of the rod fromwhich the hook Gr is formed, and the shank of said hook is passedthrough said hole, while the point rests in the recess F. Thus, when thehook Gr is in position, the curve of the inner portion of the hook iscontinued in the curve of the recess D, and the lines of the two curvesunited form a circle, as shown in Fig. 4.

The nut I is fitted to the screw-thread H, and as it operates againstthe inner surface of the heel G, it may cause the shank of the hook tobe drawn more or less through the hole E, and thus contract or expandthe eye formed by the bend of the hook, more or less, as desired. f

The point of the hook being confined in the recess F prevents anyturning' of the shank in its seat, and in order to prevent the nut Ifrom being loosened by the jar of the machine during operation, theperiphery of the nut is cut with teeth J leaving spaces, into one ofwhich a detent may rest, when the nut has been brought to properposition, to prevent that position being changed; and for an efficientdetent I prefer to employ a simple spring, K,

though a latch of any other description answers every requirement.

. When it is desired to remove the nut or change the capacity of theeye, it is only necessary that the spring should be depressed todisengage it, and permit the nut to be rotated.

The recess F may be simply indented in the' face of the cutter-bar, asshown, in which case the point of the hook would require to be outdownto make it flush-withthe surface ofthe cutter-bar, as shown in thedrawings; or the point of the hook may be made cylindrical, and may beinserted lin a corresponding hole, if there be room to make one. i

The pitman L is made with a hook, M, to be inserted through the eyeformed by the hook G.

The hook M is made cylindrical Imtil the center of the bend has beenpassed, and it is then flattened on the outer side, as shown in Figs. land 5, and made quite thin at the extreme point, which is curved arormdin an arc continuous with the curve of the hook, and so as to leave asmall space between said point and the shank, as shown in Fig. 5.

The space at the point of the hook is less than the diameter of the rodof the hook G, so that it is impossible for the hooks to be detachedwhen in ordinary Working position 5 but when brought into a position sothat theattened portion near the point of hook Gr can pass through thespace opposite to the point of the hook M, then the pitman andcutter-bai" may be separated.

W'hen the hook M is in position it should exactly ll the eye of the hookG, the bend of the hook M rest-ing in the recess D, and the eye may beadjusted by means of the screw I, so that there may be freedom of motionin al1 directions, and no play or 10st motion. While kept in thatcondition the machine Will operate with efciency and Without noise orjar.

Having described my invention,what I cla-inl as neT 1s 1. Thecombination4 of the hooks M and Gr, constructed substantiallyasdescribed, `in connection with the heel C of a harvester cutterbar.

2. In combination with the hook G, to make an eye for a pitman-j oint,the nut I, constructed with the teeth J and the detent K, substantiallyas described.

3. Inv combination with a hook, M, at the end of the pitman, a hook, G,constructed and arranged as described, so that al1 adjustment for lostmotion shall be toward the heel ofthe cutter-bar, as set forth.

SALEM T. LAMB.

Witnesses:

WM. T. STILWELL, THOMAS COLLIER.

